US5439935A - Skin care method and composition - Google Patents

Skin care method and composition Download PDF

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Publication number
US5439935A
US5439935A US08/040,693 US4069393A US5439935A US 5439935 A US5439935 A US 5439935A US 4069393 A US4069393 A US 4069393A US 5439935 A US5439935 A US 5439935A
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composition
protease
glycosidase
component
oil
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US08/040,693
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Anthony V. Rawlings
Ian R. Scott
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Elizabeth Arden Inc
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Elizabeth Arden Inc
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Assigned to ELIZABETH ARDEN COMPANY, DIVISION OF CONOPCO, INC. reassignment ELIZABETH ARDEN COMPANY, DIVISION OF CONOPCO, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RAWLINGS, ANTHONY V., SCOTT, IAN R.
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q5/00—Preparations for care of the hair
    • A61Q5/006—Antidandruff preparations
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • A61K38/43—Enzymes; Proenzymes; Derivatives thereof
    • A61K38/46—Hydrolases (3)
    • A61K38/465—Hydrolases (3) acting on ester bonds (3.1), e.g. lipases, ribonucleases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • A61K38/43—Enzymes; Proenzymes; Derivatives thereof
    • A61K38/46—Hydrolases (3)
    • A61K38/47—Hydrolases (3) acting on glycosyl compounds (3.2), e.g. cellulases, lactases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • A61K38/43—Enzymes; Proenzymes; Derivatives thereof
    • A61K38/46—Hydrolases (3)
    • A61K38/48—Hydrolases (3) acting on peptide bonds (3.4)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/64—Proteins; Peptides; Derivatives or degradation products thereof
    • A61K8/66—Enzymes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00—Drugs for dermatological disorders
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00—Preparations for care of the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00—Preparations for care of the skin
    • A61Q19/007—Preparations for dry skin

Definitions

  • This invention relates to skin care methods and compositions.
  • compositions are intended for the treatment or prevention of dry skin conditions and particularly conditions wherein flaky skin cells occur on the surface of the skin.
  • the composition may also be used to alleviate acne or dandruff.
  • peripheral corneocytes In normal healthy skin there is an imperceptible shedding of peripheral corneocytes, to be replaced by lower level corneocytes, a process named desquamation. This occurs by the breakdown of the cohesive forces binding the peripheral corneocytes.
  • One of the main cohesive elements is the rivet-like desmosome which is a protein complex comprising glycoproteins anchored in the membrane, responsible for corneocyte-corneocyte adhesion. To enable desquamation to occur these glycoproteins have to be degraded by the action of specific proteases.
  • a composition for the treatment of dry skin conditions includes (1) a glycosidase and (2) a protease, the components 1 and 2 being present simultaneously in the composition or being separately presented with indications for the application of component 1 before component 2.
  • a method of relieving or ameliorating dry skin conditions which includes the topical application to the skin of (1) a glycosidase and (2) a protease, component 2 being applied to the skin not before component 1.
  • compositions may be formulated in any conventional manner and include conventional vehicles, adjuncts and additives.
  • each component is of the order of 0.00001 to 50% by weight of the composition, preferably from 0.001 to 20% and most preferably 0.1 to 10%.
  • component 1 will be applied to the skin or be present in the composition in amounts greater than component 2 in a preferred ratio of between 100:1 and 1:1.
  • compositions may additionally include lipases at a concentration of from 0.00001 to 50% by weight of the composition, preferably from 0.001 to 20% and most preferably 0.1 to 10%.
  • Glycosidases may be isolated from animal, plant fungal or bacterial sources. Typical enzymes include neuraminidase, mannosidase, galactosidase, glucosidase, N-acetyl glucosaminidase and N-acetyl galactosaminidase. Preferably these may be isolated from plant sources including almonds, green coffee beans, and spinach, or may be obtained commercially.
  • Proteases may be isolated from animal, plant fungal or bacterial sources. Suitable enzymes include bromelain, papain, chymotrypsin & chymotrypsin-like enzymes, cathepsin and cathepsin-like enzymes, alcalase, savinase, chymopapain, clostripain, endoproteinase Asp N, protease V8 pronase, proteinase K, subtilisin, trypsin & trypsin-like enzymes thermolysin & plasmin.
  • Suitable enzymes include bromelain, papain, chymotrypsin & chymotrypsin-like enzymes, cathepsin and cathepsin-like enzymes, alcalase, savinase, chymopapain, clostripain, endoproteinase Asp N, protease V8 pronase, proteina
  • the protease may be isolated from plant sources including the seeds of wheat, barley, maize, oilseed rape, cocoa, linseed, illipe, shea nut, palm kernal, jojoba bean, pea, green bean, broad bean, soya bean and sunflower, and olives, papaya, pineapple and figs.
  • Lipases may be isolated from plant, animal or bacterial sources. Suitable enzymes include lipolase, pancreatic lipases, phospholipases, ceramidase, aryl sulphatase, cholesterol esterase, candida rugosa OF360 lipase, humicola sp. lipase, pseudomonas sp. lipase and candida antarctica A & B lipases.
  • composition according to the invention also comprises a vehicle to act as a dilutant, dispersant or carrier for the active ingredients in the composition, so as to facilitate their distribution when the composition is applied to the skin and/or hair.
  • vehicle is cosmetically acceptable.
  • Vehicles other than water can include liquid or solid emollients, solvents, humectants, thickeners and powders. Examples of each of these types of vehicle, which can be used singly or as mixtures of one or more vehicles, are as follows:
  • Emollients such as stearyl alcohol, glyceryl monoricinoleate, glyceryl monostearate, mink oil, cetyl alcohol, isopropyl isostearate, stearic acid, isobutyl palmitate, isocetyl stearate, oleyl alcohol, isopropyl laurate, hexyl laurate, decyl oleate, octadecan-2-ol, isocetyl alcohol, eicosanyl alcohol, behenyl alcohol, cetyl palmitate, silicone oils such as dimethylpolysiloxane, di-n-butyl sebacate, isopropyl myristate, isopropyl palmitate, isopropyl stearate, butyl stearate, polyethylene glycol, triethylene glycol, lanolin, cocoa butter, corn oil, cotton seed oil, tallow, lard, olive oil, palm kernel oil, rapeseed
  • Propellants such as air, propane, butane, isobutane, dimethyl ether, carbon dioxide, nitrous oxide.
  • Solvents such as ethyl alcohol, methylene chloride, isopropanol, acetone, ethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monoethyl ether, dimethyl sulphoxide, dimethyl formamide, tetrahydrofuran.
  • Powders such as chalk, talc, fullers earth, kaolin, starch, gums, colloidal silica sodium polyacrylate, tetra alkyl and/or trialkyl aryl ammonium smectites, chemically modified magnesium aluminium silicate, organically modified montmorillonite clay, hydrated aluminium silicate, fumed silica, carboxyvinyl polymer, sodium carboxymethyl cellulose, ethylene glycol monostearate.
  • the vehicle will usually form from 10 to 99.9%, preferably from 50 to 99% be weight of the emulsion, and can, in the absence of other adjuncts, form the balance of the composition.
  • composition according to the invention is an emulsion, in which case an oil or oily material will normally be present, together with an emulsifier to provide either a water-in-oil emulsion or an oil-in-water emulsion, depending largely on the average hydrophillic-lyophilic balance (HLB) of the emulsifier employed.
  • HLB hydrophillic-lyophilic balance
  • composition according to the invention can optionally comprise one or more oils or other materials having the properties of an oil.
  • oils examples include mineral oil and vegetable oils, and oil materials, such as those already proposed herein as emollients.
  • oils or oily materials include silicone oils, both volatile and non-volatile, such as polydimethyl siloxanes.
  • the oil or oily material when present for the purposes for forming an emulsion, will normally form up to 90%, preferably from 10 to 80% by volume of the composition.
  • composition according to the invention can also optionally comprise one or more emulsifiers the choice of which will normally determine whether a water-in-oil or an oil-in-water emulsion is formed.
  • the chosen emulsifier or emulsifiers should normally have an average HLB value of from 1 to 6.
  • a chosen emulsifier or emulsifiers should have an average HLB value of>6.
  • Suitable emulsifiers are set out below in Table 1 in which the chemical name of the emulsifiers is given together with an example of a trade name as commercially available, and the average HLB value.
  • the amount of emulsifier or mixtures thereof, to be incorporated in the composition of the invention, when appropriate is from 1 to 50%, preferably from 2 to 20% and most preferably from 2 to 10% by weight of the composition.
  • composition of the invention can also comprise water, usually up to 98%, preferably from 5 to 80% by volume.
  • composition of the invention can also optionally comprise a high molecular weight silicone surfactant which can also act as an emulsifier, in place of or in addition to the optional emulsifier(s) already mentioned.
  • a high molecular weight silicone surfactant which can also act as an emulsifier, in place of or in addition to the optional emulsifier(s) already mentioned.
  • the silicone surfactant is a high molecular weight polymer of dimethyl polysiloxane with polyoxyethylene and/or polyoxypropylene side chains having a molecular weight of from 10,000 to 50,000 and having the structure: ##STR1## where the groups R' and R" are each chosen from --H, C 1--18 alkyl and ##STR2## a has a value of from 9 to 115, b has a value of from 0 to 50,
  • x has a value of from 133 to 673
  • y has a value of from 25 to 0.25.
  • the dimethyl polysiloxane polymer is one in which:
  • a has a value of from 10 to 114
  • b has a value of from 0 to 49
  • x has a value of from 388 to 402
  • y has a value of from 15 to 0.75 one of groups R' and R" being lauryl, and the other having a molecular weight of from 1000 to 5000.
  • a particularly preferred dimethyl polysiloxane polymer is one in which:
  • y has the value 1.25
  • the dimethyl polysiloxane polymer is conveniently provided as a dispersion in a volatile siloxane, the dispersion comprising, for example, from 1 to 20% by volume of the polymer and from 80 to 99% by volume of the volatile siloxane.
  • the dispersion consists of a 10% by volume of the polymer dispersed in the volatile siloxane.
  • volatile siloxanes in which the polysiloxane polymer can be dispersed include polydimethyl siloxane (pentamer and/or hexamer).
  • a particularly preferred silicone surfactant is cyclomethicone and dimethicone copolyol, such as DC 3225C Formulation Aid available from DOW CORNING.
  • Another is laurylmethicone copolyol, such as DC Q2-5200, also available from Dow Corning.
  • the amount of silicone surfactant, when present in the composition will normally be up to 25%, preferably from 0.5 to 15% by weight of the emulsion.
  • adjuncts examples include preservatives, such as para-hydroxy benzoate esters; antioxidants, such as butyl hydroxy toluene; humectants, such as glycerol, sorbitol, 2-pyrrolidone-5-carboxylate, dibutylphthalate, gelatin, polyethylene glycol, preferably PEG 200-600; buffers, such as lactic acid together with a base such as triethanolamine or sodium hydroxide; surfactants, such as glycerol ethers, ceramides of synthetic, animal or plant origin; phospholipids; waxes, such as beeswax, ozokerite wax, paraffin wax; plant extracts, such as Aloe vera, cornflower, witch hazel, elderflower, cucumber; thickeners; activity enhancers; colourants; perfumes; and sunscreen materials such as ultrafine titanium dioxide and organic sunscreens such as p-aminobenzoic acid and esters thereof, ethylhe
  • preservatives such
  • Metal chelators such as EDTA may be optionally included in the composition to increase activity/decrease inhibition of the enzyme(s).
  • composition according to the invention is intended primarily as a product for topical application to human skin, for treating dry flaky skin and to enhance the quality of skin.
  • the composition may also be used to alleviate acne and dandruff.
  • a small quantity of the composition for example from 1 to 5 ml, is applied to areas of the skin or hair, from a suitable container or applicator and, if necessary, it is then spread over and/or rubbed into the skin or scalp using the hand or fingers or a suitable device.
  • the topical skin and/or hair treatment composition of the invention can be formulated as a lotion having a viscosity of from 4,000 to 10,000 mPas, a fluid cream having a viscosity of from 10,000 to 20,000 mPas or a cream having a viscosity of from 20,000 to 100,000 mPas, or above.
  • the composition can be packaged in a suitable container to suit its viscosity and intended use by the consumer.
  • a lotion or fluid cream can be packaged in a bottle or a roll-ball applicator or a propellant-driven aerosol device or a container fitted with a pump suitable for finger operation.
  • composition When the composition is a cream, it can simply be stored in a non-deformable bottle or squeeze container, such as a tube or a lidded jar.
  • a non-deformable bottle or squeeze container such as a tube or a lidded jar.
  • the composition may be used for general lotions and creams, leave-on-creams, wash-off cleansers, face masks shampoos and bath oils.
  • the invention accordingly also provides a closed container containing a cosmetically acceptable composition as herein defined.
  • a dry flaky skin is induced in subjects with soap washing over a two week period in the winter months.
  • the subjects are treated with a composition comprising a suitable vehicle and (a) glycosidase alone, (b) protease alone, (c) protease and glycosidase simultaneously, (d) glycosidase followed by protease, and (e) an otherwise-identical composition lacking both glycosidase and protease.
  • a suitable vehicle comprising a suitable vehicle and (a) glycosidase alone, (b) protease alone, (c) protease and glycosidase simultaneously, (d) glycosidase followed by protease, and (e) an otherwise-identical composition lacking both glycosidase and protease.
  • Stratum corneum cells with desmosomes still attached were obtained by tape stripping human or animal skin. To release the cells from the tape the whole tape is placed into hexane and the cells were collected by centrifugation after which the hexane is aspirated. Alternatively, human plantar stratum corneum, a tissue rich in desmosomes, was ground in liquid nitrogen and dried.
  • the cells are then dispersed into buffer containing (a) glycosidase alone, (b) protease alone, (c) to ascertain the effect of prior treatment with glycosidases on the proteolytic digestion of desmosomes stratum corneum cells or plantar stratum corneum were incubated with a mixture of almond meal extract and neuramidase before addition of the protease, (d) no enzymes.
  • Desmosome digestion can then be followed microscopically by examining cell dissociation using an optical microscope. When enzymes fail to digest the desmosome the cells remain attached to each other. Thus, counting the number of dispersed cells or measuring the dispersed cell mass using a protein assay can be used as a measure of enzyme efficiency. To ensure enzymes were specifically degrading desmosomes, desmosome digestion was followed as described below.
  • the desmosomal protein, desmoglein (dg1) was isolated from the squames by extraction in a urea/SDS/ ⁇ -Mercaptoethanol buffer with subsequent purification of the dg1 glycoprotein using Concavalin A affinity chromatography.
  • the Concavalin A eluate was fractionated by sodium dodecyl sulphate polyacrylamide gel electrophoresis and electrophoretically transferred to PDVF membrane for immunoblotting.
  • the dg1 was identified using a specific antiserum with low levels of the antigen being indicative of desmosomal digestion. Results obtained are shown in Table 1.
  • This methodology allows the screening of enzymes prior to testing the most efficacious enzymes.

Abstract

A composition for topical application to the skin for alleviation or prevention of dry flaky skin conditions, dandruff or acne comprising: (1) a glycosidase; and (2) a protease the components (1) and (2) being present simultaneously in the composition or being separately presented with indication for the application of component (1) before component (2) .

Description

FIELD OF THE INVENTION
This invention relates to skin care methods and compositions.
These are intended for the treatment or prevention of dry skin conditions and particularly conditions wherein flaky skin cells occur on the surface of the skin. The composition may also be used to alleviate acne or dandruff.
BACKGROUND TO THE INVENTION & PRIOR ART
In normal healthy skin there is an imperceptible shedding of peripheral corneocytes, to be replaced by lower level corneocytes, a process named desquamation. This occurs by the breakdown of the cohesive forces binding the peripheral corneocytes. One of the main cohesive elements is the rivet-like desmosome which is a protein complex comprising glycoproteins anchored in the membrane, responsible for corneocyte-corneocyte adhesion. To enable desquamation to occur these glycoproteins have to be degraded by the action of specific proteases.
Under certain circumstances there is an aberrant breakdown of the desmosomes in the peripheral corneocytes leading to the dry-flaky skin condition. This has been demonstrated by retention of desmosomal structures and the desmosomal glycoprotein desmoglein (dg1) in the surface layer of stratum corneum, where in normal skin these cannot be readily detected.
Walsh et al in a paper presented to the British Society of Dermatology in May 1990 have suggested that the oligosaccharide chains of the stratum corneum desmosomal glycoproteins may protect the proteins from proteolytic degradation and that prior treatment with glycosidases, to remove the sugar side chains, may be required before the proteases can breakdown the adhesive proteins.
DEFINITION OF THE INVENTION
According to the invention a composition for the treatment of dry skin conditions includes (1) a glycosidase and (2) a protease, the components 1 and 2 being present simultaneously in the composition or being separately presented with indications for the application of component 1 before component 2.
In another aspect of the invention we provide a method of relieving or ameliorating dry skin conditions which includes the topical application to the skin of (1) a glycosidase and (2) a protease, component 2 being applied to the skin not before component 1.
The compositions may be formulated in any conventional manner and include conventional vehicles, adjuncts and additives.
The concentration of each component is of the order of 0.00001 to 50% by weight of the composition, preferably from 0.001 to 20% and most preferably 0.1 to 10%. Preferably component 1 will be applied to the skin or be present in the composition in amounts greater than component 2 in a preferred ratio of between 100:1 and 1:1.
compositions may additionally include lipases at a concentration of from 0.00001 to 50% by weight of the composition, preferably from 0.001 to 20% and most preferably 0.1 to 10%.
Glycosidases may be isolated from animal, plant fungal or bacterial sources. Typical enzymes include neuraminidase, mannosidase, galactosidase, glucosidase, N-acetyl glucosaminidase and N-acetyl galactosaminidase. Preferably these may be isolated from plant sources including almonds, green coffee beans, and spinach, or may be obtained commercially.
Proteases may be isolated from animal, plant fungal or bacterial sources. Suitable enzymes include bromelain, papain, chymotrypsin & chymotrypsin-like enzymes, cathepsin and cathepsin-like enzymes, alcalase, savinase, chymopapain, clostripain, endoproteinase Asp N, protease V8 pronase, proteinase K, subtilisin, trypsin & trypsin-like enzymes thermolysin & plasmin. Preferably the protease may be isolated from plant sources including the seeds of wheat, barley, maize, oilseed rape, cocoa, linseed, illipe, shea nut, palm kernal, jojoba bean, pea, green bean, broad bean, soya bean and sunflower, and olives, papaya, pineapple and figs.
Lipases, or similar lipid modifying enzymes, may be isolated from plant, animal or bacterial sources. Suitable enzymes include lipolase, pancreatic lipases, phospholipases, ceramidase, aryl sulphatase, cholesterol esterase, candida rugosa OF360 lipase, humicola sp. lipase, pseudomonas sp. lipase and candida antarctica A & B lipases.
THE VEHICLE
The composition according to the invention also comprises a vehicle to act as a dilutant, dispersant or carrier for the active ingredients in the composition, so as to facilitate their distribution when the composition is applied to the skin and/or hair. Preferably the vehicle is cosmetically acceptable.
Vehicles other than water can include liquid or solid emollients, solvents, humectants, thickeners and powders. Examples of each of these types of vehicle, which can be used singly or as mixtures of one or more vehicles, are as follows:
Emollients, such as stearyl alcohol, glyceryl monoricinoleate, glyceryl monostearate, mink oil, cetyl alcohol, isopropyl isostearate, stearic acid, isobutyl palmitate, isocetyl stearate, oleyl alcohol, isopropyl laurate, hexyl laurate, decyl oleate, octadecan-2-ol, isocetyl alcohol, eicosanyl alcohol, behenyl alcohol, cetyl palmitate, silicone oils such as dimethylpolysiloxane, di-n-butyl sebacate, isopropyl myristate, isopropyl palmitate, isopropyl stearate, butyl stearate, polyethylene glycol, triethylene glycol, lanolin, cocoa butter, corn oil, cotton seed oil, tallow, lard, olive oil, palm kernel oil, rapeseed oil, safflower seed oil, evening primrose oil, soybean oil, sunflower seed oil, avocado oil, olive oil, sesame seed oil, coconut oil, arachis oil, castor oil, acetylated lanolin alcohols, petroleum jelly, mineral oil, butyl myristate, isostearic acid, palmitatic acid, isopropyl linoleate, lauryl lactate, myristyl lactate, decyl oleate, myristyl myristate.
Propellants, such as air, propane, butane, isobutane, dimethyl ether, carbon dioxide, nitrous oxide.
Solvents, such as ethyl alcohol, methylene chloride, isopropanol, acetone, ethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monoethyl ether, dimethyl sulphoxide, dimethyl formamide, tetrahydrofuran.
Powders, such as chalk, talc, fullers earth, kaolin, starch, gums, colloidal silica sodium polyacrylate, tetra alkyl and/or trialkyl aryl ammonium smectites, chemically modified magnesium aluminium silicate, organically modified montmorillonite clay, hydrated aluminium silicate, fumed silica, carboxyvinyl polymer, sodium carboxymethyl cellulose, ethylene glycol monostearate.
The vehicle will usually form from 10 to 99.9%, preferably from 50 to 99% be weight of the emulsion, and can, in the absence of other adjuncts, form the balance of the composition.
OPTIONAL SKIN BENEFIT MATERIALS AND COSMETIC ADJUNCTS
A particularly convenient form of the composition according to the invention is an emulsion, in which case an oil or oily material will normally be present, together with an emulsifier to provide either a water-in-oil emulsion or an oil-in-water emulsion, depending largely on the average hydrophillic-lyophilic balance (HLB) of the emulsifier employed.
Oil or Oily Material
The composition according to the invention can optionally comprise one or more oils or other materials having the properties of an oil.
Examples of suitable oils include mineral oil and vegetable oils, and oil materials, such as those already proposed herein as emollients. Other oils or oily materials include silicone oils, both volatile and non-volatile, such as polydimethyl siloxanes.
The oil or oily material, when present for the purposes for forming an emulsion, will normally form up to 90%, preferably from 10 to 80% by volume of the composition.
Emulsifier
The composition according to the invention can also optionally comprise one or more emulsifiers the choice of which will normally determine whether a water-in-oil or an oil-in-water emulsion is formed.
When a water-in-oil emulsion is required, the chosen emulsifier or emulsifiers should normally have an average HLB value of from 1 to 6. When an oil-in-water emulsion is required, a chosen emulsifier or emulsifiers should have an average HLB value of>6.
Examples of suitable emulsifiers are set out below in Table 1 in which the chemical name of the emulsifiers is given together with an example of a trade name as commercially available, and the average HLB value.
              TABLE 1                                                     
______________________________________                                    
Chemical Name                                                             
of Emulsifier   Trade Name     HLB Value                                  
______________________________________                                    
Sorbitan trioleate                                                        
                Arlacel 85     1.8                                        
Sorbitan tristearate                                                      
                Span 65        2.1                                        
Glycerol monooleate                                                       
                Aldo MD        2.7                                        
Glycerol monostearate                                                     
                Atmul 84S      2.8                                        
Glycerol monolaurate                                                      
                Aldo MC        3.3                                        
Sorbitan sesquioleate                                                     
                Arlacel 83     3.7                                        
Sorbitan monooleate                                                       
                Arlacel 80     4.3                                        
Sorbitan monostearate                                                     
                Arlacel 60     4.7                                        
Poloxyethylene (2)                                                        
                Brij 72        4.9                                        
stearyl ether                                                             
Poloxyethylene sorbitol                                                   
                G-1702         5.0                                        
beeswax derivative                                                        
PEG 200 dilaurate                                                         
                Emerest 2622   6.3                                        
Sorbitan monopalmitate                                                    
                Arlacel 40     6.7                                        
Polyoxyethylene (3.5)                                                     
                Emulgen 903    7.8                                        
nonyl phenol                                                              
PEG 200 monostearate                                                      
                Tegester PEG   8.5                                        
                200 MS                                                    
Sorbitan monolaurate                                                      
                Arlacel 200    8.6                                        
PEG 400 dioleate                                                          
                Tegester PEG   8.8                                        
                400-DO                                                    
Polyoxyethylene (5)                                                       
                Ethofat 60-16  9.0                                        
monostearate                                                              
Polyoxyethylene (4) sorbitan                                              
                Tween 61       9.6                                        
monostearate                                                              
Polyoxyethylene (4) lauryl                                                
                Brij 30        9.7                                        
ether                                                                     
Polyoxyethylene (5) sorbitan                                              
                Tween 81       10.0                                       
monooleate                                                                
PEG 300 monooleate                                                        
                Neutronyx 834  10.4                                       
Polyoxyethylene (20)                                                      
                Tween 65       10.5                                       
sorbitan tristearate                                                      
Polyoxyethylene (20)                                                      
                Tween 85       11.0                                       
sorbitan trioleate                                                        
Polyoxyethylene (8)                                                       
                Myrj 45        11.1                                       
monostearate                                                              
PEG 400 monooleate                                                        
                Emerest 2646   11.7                                       
PEG 400 monostearate                                                      
                Tegester PEG 400                                          
                               11.9                                       
Polyoxyethylene 10                                                        
                Ethofat 0/20   12.2                                       
monooleate                                                                
Polyoxyethylene (10)                                                      
                Brij 76        12.4                                       
stearyl ether                                                             
Polyoxyethylene (10)                                                      
                Brij 56        12.9                                       
cetyl ether                                                               
Polyoxyethylene (9.3)                                                     
                Triton X-100   13.0                                       
octyl phenol                                                              
Polyoxyethylene (4)                                                       
                Tween 21       13.3                                       
sorbitan monolaurate                                                      
PEG 600 monooleate                                                        
                Emerest 2660   13.7                                       
PEG 1000 dilaurate                                                        
                Kessco         13.9                                       
Polyoxyethylene sorbitol                                                  
                G-1441         14.0                                       
lanolin derivative                                                        
Polyoxyethylene (12)                                                      
                Ethosperse LA-12                                          
                               14.4                                       
lauryl ether                                                              
PEG 1500 dioleate                                                         
                Pegosperse 1500                                           
                               14.6                                       
Polyoxyethylene (14)                                                      
                Arosurf HFL-714                                           
                               14.8                                       
laurate                                                                   
Polyoxyethylene (20                                                       
                Tween          14.9                                       
sorbitan monostearate                                                     
Polyoxyethylene 20 sorbitan                                               
                Tween 80       15.0                                       
monooleate                                                                
Polyoxyethylene (20)                                                      
                Brij 78        15.3                                       
stearyl ether                                                             
Polyoxyethylene (20)                                                      
                Tween 40       15.6                                       
sorbitan monopalmitate                                                    
Polyoxyethylene (20) cetyl                                                
                Brij 58        15.7                                       
ether                                                                     
Polyoxyethylene (25)                                                      
                G-2162         16.0                                       
oxypropylene                                                              
monostearate                                                              
Polyoxyethylene (20)                                                      
                Tween 20       16.7                                       
sorbitol monolaurate                                                      
Polyoxyethylene (23)                                                      
                Brij 35        16.9                                       
lauryl ether                                                              
Polyoxyethylene (50)                                                      
                Myrj 53        17.9                                       
monostearate                                                              
PEG 4000 monostearate                                                     
                Pegosperse 4000                                           
                               18.7                                       
                MS                                                        
______________________________________
The foregoing list of emulsifiers is not intended to be limiting and merely exemplifies selected emulsifiers which are suitable for use in accordance with the invention.
It is to be understood that two or more emulsifiers can be employed if desired.
The amount of emulsifier or mixtures thereof, to be incorporated in the composition of the invention, when appropriate is from 1 to 50%, preferably from 2 to 20% and most preferably from 2 to 10% by weight of the composition.
Water
The composition of the invention can also comprise water, usually up to 98%, preferably from 5 to 80% by volume.
Silicone Surfactant
The composition of the invention can also optionally comprise a high molecular weight silicone surfactant which can also act as an emulsifier, in place of or in addition to the optional emulsifier(s) already mentioned.
The silicone surfactant is a high molecular weight polymer of dimethyl polysiloxane with polyoxyethylene and/or polyoxypropylene side chains having a molecular weight of from 10,000 to 50,000 and having the structure: ##STR1## where the groups R' and R" are each chosen from --H, C1--18 alkyl and ##STR2## a has a value of from 9 to 115, b has a value of from 0 to 50,
x has a value of from 133 to 673,
y has a value of from 25 to 0.25.
Preferably, the dimethyl polysiloxane polymer is one in which:
a has a value of from 10 to 114
b has a value of from 0 to 49
x has a value of from 388 to 402
y has a value of from 15 to 0.75 one of groups R' and R" being lauryl, and the other having a molecular weight of from 1000 to 5000.
A particularly preferred dimethyl polysiloxane polymer is one in which:
a has the value 14
b has the value 13
x has the value 249
y has the value 1.25
The dimethyl polysiloxane polymer is conveniently provided as a dispersion in a volatile siloxane, the dispersion comprising, for example, from 1 to 20% by volume of the polymer and from 80 to 99% by volume of the volatile siloxane. Ideally, the dispersion consists of a 10% by volume of the polymer dispersed in the volatile siloxane.
Examples of the volatile siloxanes in which the polysiloxane polymer can be dispersed include polydimethyl siloxane (pentamer and/or hexamer).
A particularly preferred silicone surfactant is cyclomethicone and dimethicone copolyol, such as DC 3225C Formulation Aid available from DOW CORNING. Another is laurylmethicone copolyol, such as DC Q2-5200, also available from Dow Corning.
The amount of silicone surfactant, when present in the composition will normally be up to 25%, preferably from 0.5 to 15% by weight of the emulsion.
Other Adjuncts
Examples of conventional adjuncts which can optionally be employed include preservatives, such as para-hydroxy benzoate esters; antioxidants, such as butyl hydroxy toluene; humectants, such as glycerol, sorbitol, 2-pyrrolidone-5-carboxylate, dibutylphthalate, gelatin, polyethylene glycol, preferably PEG 200-600; buffers, such as lactic acid together with a base such as triethanolamine or sodium hydroxide; surfactants, such as glycerol ethers, ceramides of synthetic, animal or plant origin; phospholipids; waxes, such as beeswax, ozokerite wax, paraffin wax; plant extracts, such as Aloe vera, cornflower, witch hazel, elderflower, cucumber; thickeners; activity enhancers; colourants; perfumes; and sunscreen materials such as ultrafine titanium dioxide and organic sunscreens such as p-aminobenzoic acid and esters thereof, ethylhexyl p-methoxycinnamate, 2-ethoxyethyl p-methoxycinnamate and butyl methoxydibenzoylmethane and mixtures thereof.
Metal chelators such as EDTA may be optionally included in the composition to increase activity/decrease inhibition of the enzyme(s).
USE OF THE COMPOSITION
The composition according to the invention is intended primarily as a product for topical application to human skin, for treating dry flaky skin and to enhance the quality of skin. The composition may also be used to alleviate acne and dandruff.
In use, a small quantity of the composition, for example from 1 to 5 ml, is applied to areas of the skin or hair, from a suitable container or applicator and, if necessary, it is then spread over and/or rubbed into the skin or scalp using the hand or fingers or a suitable device.
PRODUCT FORM AND PACKAGING
The topical skin and/or hair treatment composition of the invention can be formulated as a lotion having a viscosity of from 4,000 to 10,000 mPas, a fluid cream having a viscosity of from 10,000 to 20,000 mPas or a cream having a viscosity of from 20,000 to 100,000 mPas, or above. The composition can be packaged in a suitable container to suit its viscosity and intended use by the consumer. For example, a lotion or fluid cream can be packaged in a bottle or a roll-ball applicator or a propellant-driven aerosol device or a container fitted with a pump suitable for finger operation. When the composition is a cream, it can simply be stored in a non-deformable bottle or squeeze container, such as a tube or a lidded jar. The composition may be used for general lotions and creams, leave-on-creams, wash-off cleansers, face masks shampoos and bath oils.
The invention accordingly also provides a closed container containing a cosmetically acceptable composition as herein defined.
EXAMPLES
The following examples are to illustrate compositions for topical application embodying the present invention.
A typical oil-in-water cream:
______________________________________                                    
                 % w/w                                                    
______________________________________                                    
Glycosidase        0.5                                                    
Protease           0.5                                                    
Mineral Oil        4.0                                                    
Cetyl Alcohol PoE  4.0                                                    
Cetylalcohol       4.0                                                    
Triethanolamine     0.7S                                                  
Butane 1, 3 diol   3.0                                                    
Xantham Gum        0.3                                                    
Preservative       0.4                                                    
Perfume            qS                                                     
Butylated hydroxytoluene                                                  
                    0.01                                                  
Water              to 100                                                 
______________________________________
A typical lotion:
______________________________________                                    
                 % w/w                                                    
______________________________________                                    
Glycosidase        0.5                                                    
Protease           0.5                                                    
Ethanol            10.0                                                   
Perfume            qS                                                     
Butylated hydroxytoluene                                                  
                   0.01                                                   
Water              to 100                                                 
______________________________________
A high internal phase, water-in-oil emulsion:
______________________________________                                    
                   % w/w                                                  
______________________________________                                    
Fully hydrogenated coconut oil                                            
                     3.9                                                  
Glycosidase          0.5                                                  
Protease             0.5                                                  
Polyoxyethylene oleyl ether                                               
                     5.0                                                  
Bentone 38           0.5                                                  
Preservative         0.3                                                  
MgSO.sub.4 7H.sub.2 O                                                     
                     0.3                                                  
Butylated hydroxytoluene                                                  
                     0.01                                                 
Perfume              qS                                                   
Water                to 100                                               
______________________________________
In Vivo Efficacy Test
To establish the effectiveness of the composition treatment in vivo, a dry flaky skin is induced in subjects with soap washing over a two week period in the winter months. When dryness has been produced, the subjects are treated with a composition comprising a suitable vehicle and (a) glycosidase alone, (b) protease alone, (c) protease and glycosidase simultaneously, (d) glycosidase followed by protease, and (e) an otherwise-identical composition lacking both glycosidase and protease. Each day the subject's skin condition is assessed by visual grading of the skin, on a scale of 1 to 5 of increasing dryness. No significant improvement is observed in (a), (b) or (e), but there is significant improvement with (c) and even greater improvement with (d).
In Vitro Assay to Screen for Desmosome Digestion Activity
Stratum corneum cells with desmosomes still attached were obtained by tape stripping human or animal skin. To release the cells from the tape the whole tape is placed into hexane and the cells were collected by centrifugation after which the hexane is aspirated. Alternatively, human plantar stratum corneum, a tissue rich in desmosomes, was ground in liquid nitrogen and dried. The cells are then dispersed into buffer containing (a) glycosidase alone, (b) protease alone, (c) to ascertain the effect of prior treatment with glycosidases on the proteolytic digestion of desmosomes stratum corneum cells or plantar stratum corneum were incubated with a mixture of almond meal extract and neuramidase before addition of the protease, (d) no enzymes.
Desmosome digestion can then be followed microscopically by examining cell dissociation using an optical microscope. When enzymes fail to digest the desmosome the cells remain attached to each other. Thus, counting the number of dispersed cells or measuring the dispersed cell mass using a protein assay can be used as a measure of enzyme efficiency. To ensure enzymes were specifically degrading desmosomes, desmosome digestion was followed as described below. The desmosomal protein, desmoglein (dg1) was isolated from the squames by extraction in a urea/SDS/β-Mercaptoethanol buffer with subsequent purification of the dg1 glycoprotein using Concavalin A affinity chromatography. The Concavalin A eluate was fractionated by sodium dodecyl sulphate polyacrylamide gel electrophoresis and electrophoretically transferred to PDVF membrane for immunoblotting. The dg1 was identified using a specific antiserum with low levels of the antigen being indicative of desmosomal digestion. Results obtained are shown in Table 1.
This methodology allows the screening of enzymes prior to testing the most efficacious enzymes.
              TABLE 1                                                     
______________________________________                                    
Treatment              dg1 Levels                                         
______________________________________                                    
Human plantar stratum corneum:                                            
Control                100%                                               
Glycosidase treatment only                                                
                        77%                                               
Trypsin treatment only (1 mg/ml)                                          
                       60.1%                                              
Glycosidase + chymotrypsin (1 mg/ml)                                      
                       0.1%                                               
Glycosidase + trypsin (1 mg/ml)                                           
                       15.7%                                              
Glycosidase + pronase (1 mg/ml)                                           
                       11.5%                                              
Pig stratum corneum:                                                      
Control                100%                                               
Glycosidase + chymotrypsin (1 mg/ml)                                      
                        0%                                                
Glycosidase + trypsin (1 mg/ml)                                           
                        0%                                                
Glycosidase + bromelain (1 mg/ml)                                         
                       44.9%                                              
Glycosidase + ficin (1 mg/ml)                                             
                       47.4%                                              
______________________________________

Claims (11)

We claim:
1. A composition for the treatment of dry skin conditions comprising:
(1) a glycosidase selected from the group consisting of neuraminidase. mannosidase, galactosidase, glucosidase, N-acetyl glucoaminidase and N-acetyl galactosaminidase; and
(2) a protease selected from the group consisting of bromelain, papain, chymotrypsin, cathepsin, alcalase, savinase, chymopapain, clostripain, endoproteinase Asp N, protease V8 pronase, proteinase K, subtilisin, trypsin, thermolysin and plasmin;
the components (1) and (2) being separately presented with indication for the application of component (1) before component (2)
wherein the composition comprises from 0.00001 to 50% by weight of the composition of the glycosidase and the protease.
2. A cosmetic composition according to claim 1 wherein the composition comprises 0.001 to 20% by weight of the composition of a glycosidase and a protease.
3. A cosmetic composition according to claim 1 wherein the ratio of component (1) to component (2) is in the range 100:1 to 1:1.
4. A composition according to claim 1 wherein the composition additionally comprises a lipase.
5. A composition according to claim 1 wherein the composition further comprises a cosmetically acceptable vehicle for the enzymes.
6. A method of relieving or ameliorating dry skin conditions, the method comprising applying topically to the skin a composition comprising
(1) a glycosidase selected from the group consisting of neuraminidase, mannosidase, galactosidase, glucosidase, N-acetyl glucoaminidase and N-acetyl galactosaminidase; and
(2) a protease selected from the group consisting of bromelain, papain, chymotrypsin, cathepsin, alcalase, savinase, chymopapain, clostripain, endoproteinase Asp N, protease V8 pronase, proteinase K, subtilisin, trypsin, thermolysin and plasmin;
the components (1) and (2) being present simultaneously in the composition or being separately presented with indication for the application of component (1) before component (2).
7. A method according to claim 6 wherein the composition comprises 0.00001 to 50% by weight of the composition of a glycosidase and a protease.
8. A method according to claim 1 wherein the composition comprises 0.001 to 20% by weight of the composition of a glycosidase and a protease.
9. A method according to claim 6 wherein the ratio of component (1) to component (2) is in the range of from 100:1 to 1:1.
10. A method according to claim 1 wherein the composition additionally comprises a lipase.
11. A method according to claim 1 wherein the composition further comprises a cosmetically acceptable vehicle for the enzymes.
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US5554366A (en) * 1992-04-02 1996-09-10 Elizabeth Arden Co., Division Of Conopco, Inc. Skin care method and composition
US20060134641A1 (en) * 1992-05-22 2006-06-22 Franklin Richard L Treating viral infections with krill enzymes
US20050025722A1 (en) * 1992-05-22 2005-02-03 Franklin Richard L. Removing dental plaque with krill enzymes
US7947270B2 (en) 1992-05-22 2011-05-24 Arcimboldo Ab Removing dental plaque with krill enzymes
US5665687A (en) * 1994-06-17 1997-09-09 L'oreal Cleaning composition containing lipid grains
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EP0633764A1 (en) 1995-01-18
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DE69325366D1 (en) 1999-07-22
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EP0633764B1 (en) 1999-06-16
JPH07505383A (en) 1995-06-15
CA2133085A1 (en) 1993-10-14
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ATE181231T1 (en) 1999-07-15
BR9306178A (en) 1998-06-23

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